Telephone system
CA 2126642 C · Owner: Toshiba Corporation · Inventors: Yamamoto, Keiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A telephone system has a plurality of telephone terminals, a plurality of individual identification information input devices associated with the telephone terminals respectively, for entering individual identification information telephone terminal data memory devices for storing telephone terminal data corresponding to individual identification information and related to telephone services accessible through the telephone terminals, a first memory table for storing data to retrieve individual identification information from one of the telephone terminals which is used a, table manager for rewriting the data stored in the first memory table in a manner to associate individual …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 23, 1994 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.